Alex Neill, Which? Managing Director of Home Products and Services, said: "It’s shocking that VW and Seat are selling thousands of cars that they know have a serious safety issue, but don’t yet have a proper fix for.

"Volkswagen Group should not be selling these potentially dangerous vehicles at all.

"Supplying a warning sticker is a shockingly inadequate response to fault which is putting lives at risk.

"It’s another example of how the current car recall system is failing to protect people.

"The DVSA (Driver and Vehicle Standards Agency) must be given the powers it needs to hold manufacturers to account."

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A VW Group spokesperson said: "We have asked retailers to ensure that all prospective purchasers of affected new or used vehicles are made aware of the current guidance not to use the middle rear seat.

"A warning sticker will be sent to customers in due course.

"They should attach it to their dash panel so that all other vehicle users are informed at all times that the rear middle seat position must not be occupied until the permanent measure has been applied."